snarfed
re-fetch silo profiles periodically to pick up new homepage links
...e.g. when users sign up for bridgy, then later add a link to their web site. this bit @dshanske recently: http://indiewebcamp.com/irc/2014-10-23#t1414072684397
as a data point, @dshanske re-registered, we picked up his domain, and we actually did send recent responses when we found syndication links.
the repro logic in #226 is a bit complicated, and i admit i don't fully understand it, but it's nice to know that it's at least somewhat narrow, ie re-registering sometimes does work.
this would also be useful for detecting when accounts go private/protected after signing up (#628).
also, we could do this for Twitter and Instagram as part of poll, since we get the full Twitter user object in each tweet, and we'll get most of the Instagram user too when we switch to scraping (#603).